
NAME
r.in.wms - Downloads and imports data from WMS servers.
KEYWORDS
raster, import, wms
SYNOPSIS
r.in.wms
r.in.wms help
r.in.wms [-ldockpga] [output=string] mapserver=string [layers=string[,string,...]] [styles=string[,string,...]] [srs=string] format=string [wmsquery=string] maxcols=integer maxrows=integer [tileoptions=string] [region=string] [folder=string] method=string [cap_file=string] [--overwrite] [--verbose] [--quiet]
Flags:
- -l
- List available layers and exit
- -d
- Skip to downloading (to resume downloads faster)
- -o
- Don't request transparent data
- -c
- Clean existing data out of download directory
- -k
- Keep band numbers instead of using band color names
- -p
- Don't reproject the data, just patch it
- -g
- Use GET method instead of POST data method
- This may be needed to connect to servers which lack POST capability
- -a
- Use GDAL WMS driver
- --overwrite
- Allow output files to overwrite existing files
- --verbose
- Verbose module output
- --quiet
- Quiet module output
Parameters:
- output=string
- Name for output raster map
- mapserver=string
- Mapserver to request data from
- layers=string[,string,...]
- Layers to request from map server
- styles=string[,string,...]
- Styles to request from map server
- srs=string
- Source projection to request from server
- Default: EPSG:4326
- format=string
- Image format requested from the server
- Options: geotiff,tiff,jpeg,gif,png
- Default: geotiff
- wmsquery=string
- Addition query options for server
- Default: version=1.1.1
- maxcols=integer
- Maximum columns to request at a time
- Default: 1024
- maxrows=integer
- Maximum rows to request at a time
- Default: 1024
- tileoptions=string
- Additional options for r.tileset
- region=string
- Named region to request data for. Current region used if omitted
- folder=string
- Folder to save downloaded data to (default $GISDBASE/wms_download)
- method=string
- Reprojection method to use
- Options: near,bilinear,cubic,cubicspline
- Default: near
- cap_file=string
- Filename to save capabilities XML file to
- Requires list available layers flag
DESCRIPTION
r.in.wms handles all of downloading and importing raster data
from an OGC
WMS web mapping server. It need only be told the desired data to
collect (bounds and resolution) via a region, the server to get the
data from, and the layer or layers to get. It downloads the data in
tiles, reprojects it, imports it, and patches it back together.
NOTES
By default data is downloaded to $GISDBASE/wms_download. This can be changed
by setting the folder option when using r.in.wms.
To understand the data you are getting it is necessary to look at the
capabilities of the WMS server. This should be available via a capabilities
request. This is an
example
capabilities request to NASA's OnEarth server.
Other brain-dead servers will not accept queries in the form of POST data.
If you get an error try using the -g flag to force r.in.wms
to send an atomic GET request instead.
EXAMPLES
General Get Capabilities Request
A capabilities request like
http://wms.jpl.nasa.gov/wms.cgi?request=GetCapabilities
is where you should start. It tells you what data is offered, the projections
it is in, where to find meta data, resolutions, scales, and bounds for
data, etc.
E.g. lists the layers available from the NASA OnEarth server.
r.in.wms mapserver=http://wms.jpl.nasa.gov/wms.cgi -l
US NED Elevation from OnEarth server download (metric units)
Set the resolution to 30 (assuming you're in metric units):
g.region res=30 -ap
r.in.wms -o output=elevation_meters mapserver=http://wms.jpl.nasa.gov/wms.cgi \
layers=us_ned styles=real
Downloads real number meter elevation from OnEarth to cover the current
region. Uses -o for opaque to get smaller download.
US NED Elevation from OnEarth server download (feet units)
Set the resolution to 90 (assuming you're in feet units) a save this
region with a name; this makes resuming downloads possible or rather
easier:
g.region res=90 -ap
g.region save=panhandle-90ft
r.in.wms -o output=elevation_feet mapserver=http://wms.jpl.nasa.gov/wms.cgi \
layers=us_ned styles=feet_real region=panhandle-90ft
Downloads real number feet elevation from OnEarth to cover the current
region. Uses -o for opaque to get smaller download. Using a named
region lets us resume later easily.
r.in.wms -d output=elevation_feet mapserver=http://wms.jpl.nasa.gov/wms.cgi \
layers=us_ned styles=feet_real -o region=panhandle-90ft method=cubic
Use flag -d to skip ahead to downloading. This could be used to try
downloading again (if some files failed last time) or to import the data
differently. Since downloaded files are remembered those already received
successfully are not re-requested. In this case we are reimporting the
data using the cubic interpolation method instead of nearest neighbor.
LANDSAT from OnEarth server download
Set the resolution to 30 meters for LANDSAT:
g.region res=30 -ap
r.in.wms layers=global_mosaic mapserver=http://wms.jpl.nasa.gov/wms.cgi \
output=wms_global_mosaic
Downloads LANDSAT color scene.
DRG from Terraserver server download
Set the resolution to 1.2 meters for DRGs. Their native resolution is
2.4 meters, so this is some pretty hefty oversampling:
g.region res=1.2 -ap
g.region save=drg-resolution
r.in.wms output=terraserver-drg mapserver=http://terraserver.microsoft.com/ogcmap6.ashx \
layers=DRG region=drg-resolution format=jpeg srs=EPSG:26910
Downloads digital raster graphics from Microsoft TerraServer. Note that
srs will need to be changed to a projection that is appropriate for your
region.
TODO
SEE ALSO
r.tileset,
r.in.gdal,
r.patch,
r.colors,
r.composite
v.in.wfs
AUTHORS
Soeren Gebbert, Jachym Cepicky, and Cedric Shock
Updated for GRASS 7 by Martin Landa, CTU in Prague, Czech Republic (05/2009)
Last changed: $Date: 2010-09-24 06:07:35 -0700 (Fri, 24 Sep 2010) $
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